Speak to Navarrogg to travel to the Dragon's Spine in Neltharion's Lair.
Beneath us lies the former home of the dragon Neltharion. You may know him as Deathwing. If your titan watcher friend detected an essence of dragon magic coalescing nearby, it may be an echo of the power of the dragonflights. Such power will be coveted by others as well. This force is likely originating from the most potent area within the lair--the decaying bones of my kin slain in the throes of Deathwing's fury. We must go before the essence falls into the wrong hands.